Warp stop-motion for looms



Sept. 20, 1932. T. c. WAGNER WARP STOP MOTION FOR LOOMS Filed Aug. 14, 1930 /m en fan Patented Sept. 20, 1932 UITED ST T E S "ATENT OFFICE WARP STOP-MOTION FOR LOOMS Application filed. August 14, 1930, Serial No. 475,208, and in Germany March 26, 1929.

This invention relates to an electric warp stop-motion for looms of the kind employing detector healds which are supported on the warp threads and which, on dropping at the a breaking of a thread, close an electric circuit whereby the loom is stopped.

It has been found in practice that the end loops of adjacent detector healds are liable to ride on or interengage with one another so as to prevent the heald of a broken warp thread from making the necessary electric contact when the heald frame is lowered.

The object of the present invention is to obviate this defect, and the invention consists in extending the detector healds beyond the eyes through a distance greater than the dis-7 placement of the healds relative to one another and to the carrier rail.

This may be eifected by twisting the wires 29 together beyond the eyes or by extending the eyes themselves and filling in the extended portion by metal plates.

Figs. 1 and 2 of the accompanying drawing represent views of tWo different forms of the detector healds wherein the wires are twisted together beyond the eyes, and

Figs. 3, 4 and 5 are views of different constructions of healds with filled in eyes.

The detector healds 6 are provided in 39 known manner with end loops 7 and 8. The

upper loop 7 embraces a carrier rail 18 fitted with insulated electric contacts adapted to support the heald and to be connected by the latter so as to close the circuit of an electric device whereby the loom is stopped. The

heald has also a centrally disposed loop 9 whereby it is normally supported on a warp thread and maintained by the latter out of I, touch with the electric contacts. If the warp thread should break, the heald drops, and the circuit is then closed and the loom stopped. In order to prevent the loop of a heald whose supporting thread is broken from riding on or inter-engaging with the loops of In the arrangement shown in Figs. 1 and adjacent healds so as to be kept floating by 2, the extension 10 is formed by twisting together the two Wires whereof the heald is made. The extension may terminate, either in a small ring 11 (Fig. 1) which is soldered in position, or by a large ring 12 (Fig. 2)

which is made integrally with one or both wires.

Figs. 3 to 5 show modifications wherein the extensions are formed by plates 13 and 14 inserted into the loops so as to restrict the effective length of the latter.

In the construction shown in Figs. 1 to 3, the carrierra-il 18 is fitted with two projecting, insulated electric contacts 19 and 20, and the top edge 15 of the loop 7 is in each instance roof-shaped so that it must come to rest on both contacts. In cases where the rail itself forms one of the contacts and carries a single insulated contact 21, as shown in Figs.

4 and 5, the upper edge of the loop is either unsymmetrically roof-shaped as shown in Fig. 4 or merely oblique as shown in Fig. 5 so as to lead the heald, on dropping, into contact with the side of the rail 18.

The actual construction of the healds may 7 be varied so long as the healds are extended beyond the end loops for a distance greater than the lift of the healds relative to one another and to the carrier rail.

I claim 1. In an electro-magnetic warp stop-motion for looms, detector healds having end loops and having plates inserted in said loops so as to restrict the effective length of the loops in outward direction for a distance 5 greater than the relative lift of the healds.

2. A structure as claimed in claim 1 wherein the plate in the upper end loop of the heald is formed with inclined edges for co-operation with the loom stopping elements.

THEODORE GURT WAGNER. 

